Shedding mechanism for ribbon-looms.



K. EGGART.

SHEDDING MECHANISM FOR RIBBON LOOMS.

APPLICATION FILED OCT. 16, I915.

Patented July 4, 1916.

UNITED STATES PATENT OFFICE.

KARL EGGART, OF ARBON, SWITZERLAND, ASSIGNOR TO THE FIRM OF ADOLPI-I SA'URER, 0F ARBON, SWITZERLAND.

SHEDDING MECHANISM. FOR RIBBON-LOOMS.

Specification of Letters Patent.

Patented July 4, 1916.

Application filed October 16, 1915. Serial No. 56,173.

To all whom it may concern:

Be it known that I, KARL EGGART, a subject of the Emperor of Germany, and a resident of Arbon, Switzerland, have invented new and useful Improvements in Shedding Mechanism for Ribbon-Looms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters or figures of reference marked thereon, which form a part of this specification.

In order to prevent a relative to and fro movement of the warp threads in the eyes of the heddles during the opening and closing of the shed, in the operation of ribbon looms, it has been proposed heretofore to curve the heddle leaves in the arcs of circles, the radii of which are equal to the distance of the leaves from their axis of oscillation, which axis is coincident with the line of insertion of the weft thread in the shed. Since in such a construction the distance between the heddle eyes and the line of insertion of the weft is always the same, there is no to and fro movement of the warp threads in the heddle eyes, such as occurs in other constructions, and therefore no rubbing of the warp threads in the eyes of the heddles other than that due to the progressive movement of the warp threads. This construction with curved leaves, however, has the disadvantages that the curved heddles cannot be kept under tension and therefore are not capable of accurate and close adjustment. If the curved heddles are made thick enough to have the stifiness necessary to prevent lateral displacement and to preserve proper relationship, as well as to preserve the true curvature, not only are the warp threads too widely distributed, but the loom itself must have such width as to be impracticable for its intended purposes.

The object of this invention is to eliminate the disadvantages in the use of curved leaves which have just been referred to, and at the same time to retain the advantage of unvarying distance between the heddle eyes and the line of insertion of the weft so that there shall be no rubbing to and fro of the warp threads in the heddle eyes.

In accordance with the invention the heddles are placed in straight frames, so that the heddles, being kept under tension, may be thin and close together, and the heddle frames are pivotally supported by arms which swing on fixed axes in the same plane with the line of insertion of theweft, so that, while the frames retain always their parallel relation, the distance from the heddle eyes to the line of insertion of the weft remains always the same and there is consequently no to and fro rubbing of the warp threads in the heddle eyes.

One convenient mode of carrying the invention into practice is illustrated by way of example in the accompanying drawing, in which,

Figure 1 is a view of the improved ribbon loom seen in the direction of the arrow A of Fig. 2; and Fig. 2 is a view of the same in side elevation partly in section.

The upper part of the frame 1 of the machine is provided with a guide for the slide 4: which carries the spool 3 for the weft thread. On the frame 1 are provided brackets 5 to support a fixed shaft 6 on which are loosely mounted-arms 7 and 8 in two pairs. To the free ends of these arms are pivotally connected the upper ends of the heddle frames 9, 10, in which are secured under tension, in the usual manner, straight heddles 11, provided with eyes 12 through which pass the warp threads 13. On studs 14:, at opposite sides of the frame of the machine, are mounted levers 15, 16 which are pivotally connected at one end to the frames 9, 10, respectively, while at the other end they are respectively connected by means of links 17 18 to cranks 19, 20 mounted on the driving shaft 21 of the machine. The cranks 19, 20 are set at 180 apart so that, upon rotation of the driving shaft 21, the frames 9, 10 are moved alternately up and down in opposite directions with the heddles, and the heddles 11 are caused to open and close the shed.

Since the frames 9, 10 are pivotally supported respectively, at their upper and lower ends, by arms of equal length which swing on axes in the same plane with the line of insertion of the weft, it will be seen that the frames retain their parallel relation during their movements and that the distance of the heddle eyes from the line of insertion of the weft remains always the same and there is consequently no rubbing to and fro of the Warp threads in the eyes of the heddles. At the same time the straight heddles can be placed under tension in the straight frames and can therefore be made very thin and placed close together, with a large number in a narrow space.

I claim as my invention:

1. In a ribbon loom, straight heddle leaves, means for supporting the heddle leaves to move in parallel relation with the heddle eyes at an unchanging distance from the line of insertion of the weft, and means to actuate the heddle leaves alternately in opposite directions.

2. In a ribbon loom, straight heddle leaves, swinging arms to which the leaves are pivot-ally connected at their opposite ends, and means to actuate the heddle leaves alternately in opposite directions.

3. In a ribbon loom, straight heddle leaves, arms pivotally connected to the heddle leaves at their opposite ends and mounted to swing on axes in the same plane with the line of insertion of the Weft, and means to actuate the heddle leaves alternately in opposite directions.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing Witnesses.

KA RL EGGART;

\Vitnesses FRANK DINNUKE, EMIL MEILE.

Copies of thh patent may be obtained for five cents each, by addressingthe Commiuioner of retail. Washington, D. C. 

